[Python] Add scalar value support for Dictionary type

[asfimport]

There is not a DictionaryValue implemented in pyarrow.scalar

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

_{Note: This issue was originally created as ARROW-552. Please see the migration documentation for further details.}

[asfimport]

Miki Tebeka / @tebeka:
I have initial implementation in my branch. However this currently segfaults and I'm having hard time debugging it.

I think the problem is py_idx = box_scalar(self.type, darr.indices(), i).as_py() but not sure.

Any ideas on how to fix this?

[asfimport]

Wes McKinney / @wesm:
Just looked. You're right, box_scalar(self.type, darr.indices(), i) isn't right because the dictionary type (self.type) and the indices don't match. Try passing the index_type instead from

https://github.com/apache/arrow/blob/master/cpp/src/arrow/type.h#L580

(it needs to be boxed)

[asfimport]

Wes McKinney / @wesm:
You could make things a little easier by adding an indices property to DictionaryArray that returns the dictionary indices as a boxed array – being able to inspect the indices is independently useful

[asfimport]

Miki Tebeka / @tebeka:
Fixed the bug with type, however now I got an error which probably means dereferencing twice.

*** Error in `python': munmap_chunk(): invalid pointer: 0x00005621bd182550 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x790cb)[0x7f15f761b0cb]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x1f8)[0x7f15f7628338]
/home/miki/work/arrow/arrow/cpp/debug/dist/lib/libarrow.so.0(+0xe69e6)[0x7f15e50af9e6]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(_ZNSt15_Sp_counted_ptrIPN5arrow8DataTypeELN9__gnu_cxx12_Lock_policyE2EE10_M_disposeEv+0x38)[0x7f15e3ee6b12]
/home/miki/work/arrow/arrow/python/pyarrow/schema.cpython-36m-x86_64-linux-gnu.so(_ZNSt16_Sp_counted_baseILN9__gnu_cxx12_Lock_policyE2EE10_M_releaseEv+0x42)[0x7f15e453500a]
/home/miki/work/arrow/arrow/python/pyarrow/schema.cpython-36m-x86_64-linux-gnu.so(_ZNSt14__shared_countILN9__gnu_cxx12_Lock_policyE2EED2Ev+0x27)[0x7f15e45345e7]
/home/miki/work/arrow/arrow/python/pyarrow/schema.cpython-36m-x86_64-linux-gnu.so(_ZNSt12__shared_ptrIN5arrow8DataTypeELN9__gnu_cxx12_Lock_policyE2EED1Ev+0x1c)[0x7f15e453405c]
/home/miki/work/arrow/arrow/python/pyarrow/schema.cpython-36m-x86_64-linux-gnu.so(_ZNSt10shared_ptrIN5arrow8DataTypeEED1Ev+0x18)[0x7f15e453409e]
/home/miki/work/arrow/arrow/python/pyarrow/schema.cpython-36m-x86_64-linux-gnu.so(_Z21__Pyx_call_destructorISt10shared_ptrIN5arrow8DataTypeEEEvRT_+0x18)[0x7f15e4534f8e]
/home/miki/work/arrow/arrow/python/pyarrow/schema.cpython-36m-x86_64-linux-gnu.so(+0x27990)[0x7f15e4528990]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0x10761)[0x7f15e3eda761]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0xf8e5)[0x7f15e3ed98e5]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0x1712b)[0x7f15e3ee112b]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0x17319)[0x7f15e3ee1319]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0xf0ec)[0x7f15e3ed90ec]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0xee32)[0x7f15e3ed8e32]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0x1712b)[0x7f15e3ee112b]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0x173e4)[0x7f15e3ee13e4]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0x8cc2)[0x7f15e3ed2cc2]
/home/miki/work/arrow/arrow/python/pyarrow/scalar.cpython-36m-x86_64-linux-gnu.so(+0x893d)[0x7f15e3ed293d]
python(PyObject_Repr+0x28)[0x5621bae4b658]
python(_PyCFunction_FastCallKeywords+0x244)[0x5621bae49304]
python(+0x1972ce)[0x5621baedb2ce]
python(_PyEval_EvalFrameDefault+0x4783)[0x5621baee0a03]
python(+0x196f1d)[0x5621baedaf1d]
python(+0x1971e4)[0x5621baedb1e4]
python(_PyEval_EvalFrameDefault+0x4783)[0x5621baee0a03]
python(+0x196f1d)[0x5621baedaf1d]
python(PyEval_EvalCodeEx+0x2f)[0x5621baedbdcf]
python(+0xcf83d)[0x5621bae1383d]
/home/miki/work/arrow/arrow/python/pyarrow/array.cpython-36m-x86_64-linux-gnu.so(+0x1e8fd)[0x7f15e47638fd]
/home/miki/work/arrow/arrow/python/pyarrow/array.cpython-36m-x86_64-linux-gnu.so(+0xf2cc)[0x7f15e47542cc]
/home/miki/work/arrow/arrow/python/pyarrow/array.cpython-36m-x86_64-linux-gnu.so(+0xe8e7)[0x7f15e47538e7]
python(PyObject_Str+0x75)[0x5621bae4b765]
python(PyFile_WriteObject+0xed)[0x5621bae0c1dd]
python(+0x1924c3)[0x5621baed64c3]
python(_PyCFunction_FastCallKeywords+0x1a7)[0x5621bae49267]
python(+0x1972ce)[0x5621baedb2ce]
python(_PyEval_EvalFrameDefault+0x4783)[0x5621baee0a03]
python(+0x196f1d)[0x5621baedaf1d]
python(PyEval_EvalCode+0x23)[0x5621baedbd63]
python(PyRun_FileExFlags+0x169)[0x5621badb4289]
python(PyRun_SimpleFileExFlags+0xf5)[0x5621badb44c5]
python(Py_Main+0xeaf)[0x5621badc8d6f]
python(main+0x173)[0x5621badaa563]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f15f75c23f1]
python(_start+0x2a)[0x5621badaa64a]
======= Memory map: ========
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7f15e6d38000-7f15e6e38000 rw-p 00000000 00:00 0 
7f15e6e38000-7f15e6e6f000 r-xp 00000000 08:01 6299063                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f15e6e6f000-7f15e706e000 ---p 00037000 08:01 6299063                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f15e706e000-7f15e706f000 r--p 00036000 08:01 6299063                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f15e706f000-7f15e7070000 rw-p 00037000 08:01 6299063                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f15e7070000-7f15e7090000 r-xp 00000000 08:01 6556305                    /usr/lib/python3.6/lib-dynload/_decimal.cpython-36m-x86_64-linux-gnu.so
7f15e7090000-7f15e728f000 ---p 00020000 08:01 6556305                    /usr/lib/python3.6/lib-dynload/_decimal.cpython-36m-x86_64-linux-gnu.so
7f15e728f000-7f15e7290000 r--p 0001f000 08:01 6556305                    /usr/lib/python3.6/lib-dynload/_decimal.cpython-36m-x86_64-linux-gnu.so
7f15e7290000-7f15e7299000 rw-p 00020000 08:01 6556305                    /usr/lib/python3.6/lib-dynload/_decimal.cpython-36m-x86_64-linux-gnu.so
7f15e7299000-7f15e72af000 r-xp 00000000 08:01 6433051                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/json.cpython-36m-x86_64-linux-gnu.so
7f15e72af000-7f15e74af000 ---p 00016000 08:01 6433051                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/json.cpython-36m-x86_64-linux-gnu.so
7f15e74af000-7f15e74b0000 rw-p 00016000 08:01 6433051                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/json.cpython-36m-x86_64-linux-gnu.so
7f15e74b0000-7f15e74f0000 rw-p 00000000 00:00 0 
7f15e74f0000-7f15e7571000 r-xp 00000000 08:01 6433046                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/parser.cpython-36m-x86_64-linux-gnu.so
7f15e7571000-7f15e7771000 ---p 00081000 08:01 6433046                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/parser.cpython-36m-x86_64-linux-gnu.so
7f15e7771000-7f15e7777000 rw-p 00081000 08:01 6433046                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/parser.cpython-36m-x86_64-linux-gnu.so
7f15e7777000-7f15e79ba000 rw-p 00000000 00:00 0 
7f15e79ba000-7f15e7a55000 r-xp 00000000 08:01 6433045                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_window.cpython-36m-x86_64-linux-gnu.so
7f15e7a55000-7f15e7c54000 ---p 0009b000 08:01 6433045                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_window.cpython-36m-x86_64-linux-gnu.so
7f15e7c54000-7f15e7c5b000 rw-p 0009a000 08:01 6433045                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_window.cpython-36m-x86_64-linux-gnu.so
7f15e7c5b000-7f15e7cdd000 rw-p 00000000 00:00 0 
7f15e7cdd000-7f15e7dc8000 r-xp 00000000 08:01 6433058                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_sparse.cpython-36m-x86_64-linux-gnu.so
7f15e7dc8000-7f15e7fc8000 ---p 000eb000 08:01 6433058                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_sparse.cpython-36m-x86_64-linux-gnu.so
7f15e7fc8000-7f15e7fcd000 rw-p 000eb000 08:01 6433058                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_sparse.cpython-36m-x86_64-linux-gnu.so
7f15e7fcd000-7f15e814d000 rw-p 00000000 00:00 0 
7f15e814d000-7f15e81b5000 r-xp 00000000 08:01 6433054                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_period.cpython-36m-x86_64-linux-gnu.so
7f15e81b5000-7f15e83b5000 ---p 00068000 08:01 6433054                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_period.cpython-36m-x86_64-linux-gnu.so
7f15e83b5000-7f15e83bc000 rw-p 00068000 08:01 6433054                    /home/miki/work/arrow/arrow/python/venv/lib/python3.6/site-packages/pandas/_period.cpython-36m-x86_64-linux-gnu.so
7f15e83bc000-7f15e84bd000 rw-p 00000000 00:00 0 
7f15e84bd000-7f15e84c2000 r-xp 00000000 08:01 6556322                    /usr/lib/python3.6/lib-dynload/mmap.cpython-36m-x86_64-linux-gnu.so
7f15e84c2000-7f15e86c1000 ---p 00005000 08:01 6556322                    /usr/lib/python3.6/lib-dynload/mmap.cpython-36m-x86_64-linux-gnu.so
7f15e86c1000-7f15e86c2000 r--p 00004000 08:01 6556322                    /usr/lib/python3.6/lib-dynload/mmap.cpython-36m-x86_64-linux-gnu.so[1]    18584 abort (core dumped)  python d.py

[asfimport]

Wes McKinney / @wesm:
PR: #414

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 414
#414